How to extend UI/HTML pages

[fm4tt0s]

General information

• OS Platform and Distribution (e.g., Linux Ubuntu 16.04): Linux/RHEL
• ElasticHQ Version: 3.5.12
• Elasticsearch Version: 7
• Python version (ignore is using docker image): Docker
• Browser Vendor and Version (if applicable):

Issue Description

Not quite an issue but a questions. How can I extend the pages? Like I want to put an additional link on top-menu, leading to a APM instance for example. I've tried changing below file:

/src/ui/src/components/top-nav/top-nav.template.html

then, bounced the container but it got me no results. What would be the correct way to extend that? If any available. Thanks.